topic Re: How to prevent the power button from putting the device into sleep? in i.MX Processors

How to prevent the power button from putting the device into sleep?

dennis3 — Wed, 06 May 2020 19:32:53 GMT

Our device has a power button the user can turn on/off the device like normal. In fsl-imx8mq.dtsi this is defined via the snvs_pwrkey node:

   snvs_pwrkey: snvs-powerkey {
      compatible = "fsl,sec-v4.0-pwrkey";
      regmap = <&snvs>;
      interrupts = <GIC_SPI 4 IRQ_TYPE_LEVEL_HIGH>;
      linux,keycode = <KEY_POWER>;
      wakeup-source;
     };

Power functions all work as designed except I have the need to prevent the device from going into a sleep state.

Power button long press -> show power menu, user can shutdown or reboot (OK)

Power button long press > 5 seconds -> hard shutdown (OK)

Power button short press -> sleep. (wish to disable this)

Power button short press -> wake

Can someone point me to the right layer in Android or Linux where I might change the handler to ignore the short press sleep state?

Re: How to prevent the power button from putting the device into sleep?

shivanipatel — Fri, 08 May 2020 15:56:33 GMT

Hi Dennis Muhlestein,

This is not a i.MX specific rather it is Android supported feature.

To disable the Power button short press sleep functionality, change the value of the variable "config_shortPressOnPowerBehavior" to 0 (zero) in {AOSP}/frameworks/base/core/res/res/values/config.xml file.

Hope this will help you.

Regards,

Shivani

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Re: How to prevent the power button from putting the device into sleep?

dennis3 — Wed, 13 May 2020 16:05:37 GMT

Thank you for this tip. That's exactly what I was looking for.